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These test scripts all contain a `finally:` block that attempts to print
proto_ver which does not exist:
```
print("proto_ver=%d" % (proto_ver))
```
This mistake appears to be a copy-and-paste error in commit b2a9daf ("02
broker subpub tests with v5 support") and went unnoticed because the
code is only reached if the tests fail.
Fixes: b2a9daf1 ("02 broker subpub tests with v5 support")
Closes: https://github.com/eclipse-mosquitto/mosquitto/issues/3123